exam Maths Puzzle Numerical Ability

Two marbles are drawn from a bag containing 6 white, 4 red, and 6 green marbles. Find the probability of both marbles being white.

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Solve

5(x-2)^2 = 3

I cannot figure out!
Can you please help me solve the problem...instructions...a principal of $5000 was invested in a savings account for 4 years...if the interest earned for the period was $400, what was the interest rate?